Rubber compound.



UNITED STATES PATENT OFFICE.

EUGENE VON VABGYAS, OF WASHINGTON, DISTRICT OF COLUMBIA, ASSIGNOR, BYMESNE' ASSIGNMENTS, TO JACOB G. KEENER AND E. R. SHUPE, TRUSTEES.

. RUBBER COMPOUND.

Specification of Letters Patent.

Patented Nov. 13, 1917.

No Drawing. Application filed June 24, 1915, Serial No. 36,054. RenewedJuly 30, 1917. Serial No. 183,639.

I To all whom it may concern:

Be it known that I, EUGENE VoN VARcYAs, a subject of the King ofHungary, residing at Washington, in the District of Columbia, haveinvented certain new and useful Improvements in Rubber Compounds, ofwhich the following is a specification.

This invention relates to compositions of the type commonly calledrubber compounds.

. In compositions of this character, it is desirable to provide astrengthening means which will add to the life of the compound when inuse, such as in the outer shoes of pneumatic tires and will therebygreatly reduce the cost of upkeep of devices of such character. 1

To this end oneprincipal object of the invention is to provide a rubbercompound which not only possesses requisite resiliency but also has anextremely high degree of wearing quality so that it is peculiarlyadapted for use in the outer shoes of pneumatic tires. I i

Furthermore in such compositions, it-is desirable to keep the rubbercontent down to as low a degree as possible, it being of coursenecessary to keep the rubber content sufficiently high to insure roperresiliency and binding of the remain er of the ingredientstogether. r

A second highly important object of the invention is, therefore, toprovide a rubber.

. compound wherein the rubber content will be in the lowest possibleproportion with respect to the entire compound.

I have also discovered that a very highly efiicient filler or base forsuch a compound is,

the ordinary slagfrom blast or other iron furnaces in granulated form,the slag being otherwise ca led vitrified cinder and consist ing largelyof silicate of lime in a more or less impure form.

. the rubber to a plastic state by the application of aproper degree ofheat and proper maceration and washing, and then place this rubber in asuitable mixer adding thereto the desired quantity of cork and slag.After .a thorough mixing, the mass is placed in a mold and vulcanized inthe ordinary manner. It will be understood that. wherever, in

the appended claims, iron slag is mentioned,

it is to be taken as including the vitrified cinder above mentioned.

What I claim as new is 1. As a new article of manufacture, a rub- I bercompound consisting of rubber, granulated iron slag and, cork flour, thequantity of rubber in the compound by weight being less than thecombined weights of the iron slag and cork flour.

2. As a new article of manufacture, a rubber compound consisting oftwelve ounces of rubber in its uncured state, from one and three-tenthsto three and seven-tenths ounces of dry cork flour, and twelve andone-fourth to twenty-one and -one-half ounces of iron slag in granulatedform.

In testimony whereof I aflix my signature.

, EUGENE, VON VARGYAS.

